libstdc++-v3/testsuite/experimental/string_view/inserters/wchar_t/2.cc

   1 // { dg-options "-std=gnu++1y" }
   2
   3 // Copyright (C) 2013 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // inserters
  21
  22 // NB: This file is predicated on sstreams, istreams, and ostreams
  23 // working, not to mention other major details like char_traits, and
  24 // all of the string_view class.
  25
  26 #include <experimental/string_view>
  27 #include <string>
  28 #include <fstream>
  29 #include <iostream>
  30 #include <testsuite_hooks.h>
  31
  32 // testing basic_filebuf::xsputn via stress testing with large string_views
  33 // based on a bug report libstdc++ 9
  34 // mode == out
  35 void
  36 test05(std::size_t size)
  37 {
  38   bool test [[gnu::unused]] = true;
  39
  40   const char filename[] = "inserters_extractors-2.txt";
  41   const wchar_t fillc = L'f';
  42   std::wofstream ofs(filename);
  43   std::wstring str(size, fillc);
  44   std::experimental::wstring_view strv(str);
  45
  46   // sanity checks
  47   VERIFY( str.size() == size );
  48   VERIFY( ofs.good() );
  49
  50   // stress test
  51   ofs << str << std::endl;
  52   if (!ofs.good())
  53     test = false;
  54
  55   ofs << str << std::endl;
  56   if (!ofs.good())
  57     test = false;
  58
  59   VERIFY( str.size() == size );
  60   VERIFY( ofs.good() );
  61
  62   ofs.close();
  63
  64   // sanity check on the written file
  65   std::wifstream ifs(filename);
  66   std::size_t count = 0;
  67   wchar_t c;
  68   while (count <= (2 * size) + 4)
  69     {
  70       ifs >> c;
  71       if (ifs.good() && c == fillc)
  72         {
  73           ++count;
  74           c = '0';
  75         }
  76       else
  77         break;
  78     }
  79
  80   VERIFY( count == 2 * size );
  81 }
  82
  83 int
  84 main()
  85 {
  86   test05(1);
  87   test05(1000);
  88   test05(10000);
  89
  90   return 0;
  91 }